Wireless communication method and apparatus for wireless local area network system

Abstract

A wireless communication method and apparatus in a wireless local area network (WLAN) system are disclosed. A wireless communication method according to one embodiment may include generating a high-efficiency Wi-Fi (HEW) frame including at least one of an HEW-SIG-A field and an HEW-SIG-B field which include channel information for communications according to an Orthogonal Frequency-Division Multiple Access (OFDMA) mode, and transmitting the generated HEW frame to a reception apparatus.

The invention claimed is: 
     
       1. Wireless communication method performed by a wireless communication apparatus in a wireless local area network (WLAN) system, the wireless communication method comprising:
 generating a frame comprising an SIG-A field and an SIG-B field, wherein the SIG-B field comprises bit information that comprises subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to multiple users is allowed; and 
 transmitting the generated frame to the multiple users, 
 wherein the transmitting of the frame transmits the SIG-B field using a frequency bandwidth indicated in the SIG-A field, and 
 wherein the bit information indicates a partial allocation identifier (AID) used by each channel in the OFDMA mode, and a modulation and coding mode used by each channel in the OFDMA mode. 
 
     
     
       2. The wireless communication method of  claim 1 ,
 wherein the bit information further indicates a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode. 
 
     
     
       3. The wireless communication method of  claim 1 ,
 wherein the subchannel allocation information indicates a position of each of subchannels in a channel bandwidth of 20 MHz, 40 MHz, 80 MHz, 80 MHz+80 MHz, or 160 MHz in the OFDMA mode, and 
 wherein a frequency bandwidth of each of the subchannels is greater than 0 and smaller than 20 MHz. 
 
     
     
       4. The wireless communication method of  claim 1 ,
 wherein the frequency bandwidth of each of the subchannels is dynamically set from 0 to 20 MHz. 
 
     
     
       5. The wireless communication method of  claim 1 ,
 wherein the SIG-A field comprises at least one of bit information indicating an OFDMA mode, bit information indicating a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode, and bit information indicating a coding mode of channels transmitted in the OFDMA mode. 
 
     
     
       6. The wireless communication method of  claim 1 ,
 wherein the SIG-A field comprises at least one of bit information indicating an OFDMA mode, bit information indicating a multi-user multiple-input multiple-output (MU-MIMO) mode, and bit information indicating a channel to be demodulated by each the multiple users. 
 
     
     
       7. The wireless communication method of  claim 1 , wherein the subchannel allocation information in the OFDMA mode comprises pattern information for non-adjacent subchannels. 
     
     
       8. The wireless communication method of  claim 7 , wherein the non-adjacent subchannels is indicated based on the pattern information in a bitmap format in a 20-MHz frequency bandwidth unit. 
     
     
       9. A wireless communication method performed by a wireless communication apparatus in a wireless local area network (WLAN) system, the wireless communication method comprising:
 receiving, by the wireless communication apparatus corresponding to one of multiple users from a transmission apparatus, a frame comprising an SIG-A field and an SIG-B field, wherein the SIG-B field comprises bit information that comprises subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to the multiple users is allowed; and 
 determining each of subchannels to be used for communications based on at least the subchannel allocation information, 
 wherein the receiving of the frame includes receiving the SIG-B field using a frequency bandwidth indicated in the SIG-A field, and 
 wherein the bit information indicates a partial allocation identifier (AID) used by each channel in the OFDMA mode, and a modulation and coding mode used by each channel in the OFDMA mode. 
 
     
     
       10. The wireless communication method of  claim 9 ,
 wherein the bit information further indicates a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode. 
 
     
     
       11. The wireless communication method of  claim 9 ,
 wherein the subchannel allocation information indicates a position of each of subchannels in a channel bandwidth of 20 MHz, 40 MHz, 80 MHz, 80 MHz+80 MHz, or 160 MHz in the OFDMA mode, and 
 wherein a frequency bandwidth of each of the subchannels is greater than 0 and smaller than 20 MHz. 
 
     
     
       12. The wireless communication method of  claim 9 ,
 wherein the frequency bandwidth of each of the subchannels is dynamically set from 0 to 20 MHz. 
 
     
     
       13. The wireless communication method of  claim 9 , wherein the wireless communication apparatus demodulates the SIG-B field based on an LTF comprised in the SIG-A field. 
     
     
       14. A wireless communication apparatus comprising:
 a processor to generate a frame comprising an SIG-A field and an SIG-B field, wherein the SIG-B field comprises bit information comprising subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to multiple users is allowed; and 
 a transmitter to transmit the generated frame to the multiple users, 
 wherein the transmitter, in order to transmit the generated frame transmits the SIG-B field using a frequency bandwidth indicated in the SIG-A field, and 
 wherein the bit information indicates a partial allocation identifier (AID) used by each channel in the OFDMA mode, and a modulation and coding mode used by each channel in the OFDMA mode.